[vtkusers] picking in transformed assembly doesn't work?

[derong]

Did anyone try the picking in a transformed vtkAssembly object?
If i don't transform the vtkAssembly object, i can pick every props in that
vtkAssembly object.
But after i make a transformation on that vtkAssembly object, I can not pick
those props.
 
Is it a bug in VTK? Is there any simple way to fix it?
Now i'm using VTK4..2.1. Any hint will be helpful!
 
Thx,
 
Dennis  
 
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